Hermann kemmler



(No Model.)

H. KEMMLER.

NUT} LOOK FOR SGREWS, m.

Patented Ju1y 4 V INVENTOR WITNESSES ATTORNEY UNITED STATES PATENTOFFICE.

HERMANN KEMMLER, OF EBINGEN, WURTEMBERG, GERMANY.

NUT-LOCK FOR SCREWS, 800.

SPECIFICATION forming part of Letters Patent No. 260,690, dated July 4,1882. k Application filed May 25, 1882. (No model.) Patented in GermanyMarch 25, 1882, No. 2,075. I

- of Ebingen, in the Kingdom of Wiirtemberg and Empire of Germany, haveinvented certain new and useful Improvements in Nut- Locks for Screws,&c., of which the following is a specification.

This invention has reference to an improved nut-lock for thescrew-pivots of shears, scissors, and all other purposes, by whichthelooseniug of the retaining-nut is prevented in a reliable manner andwhich is constructed in such a manner that it does not materially differin appearance from the common screw-nut of the pivots of shears,scissors, and similar articles, while it can be applied in all cases inwhich absolute security against the loosening of a screw is desirable,thus making it a perfect bolt-lock or safety-screw.

The invention consists of a screw-pivot having a fixed head and a nutscrewed on the threaded shank of the pivot, said nut having anumber ofsocket-holes arranged in a circle into which are placed projecting pinsof a capplate which is secured by a screw to the square end of thescrew-pivot, to which square end the cap-plate is fitted by a squarecenter openlng.

In the accompanying drawings, Figure 1 represents a side View of a pairof shears or scissors with my improved nut lock. Fig. 2 is a verticaltransverse section of the same; and Figs. 3, 4, and 5 are detailed-views respectively of the screw-pivot, screwnnt, and the retainingcap-plate.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the screw-pivot of my improvednut-lock, which pivot is provided at one end with a fixed head, A. Theshank of the screw-pivot A is made of slightly-larger diameter as far asit passes through the one blade of the shears or scissors, and of asomewhat smaller diameter at that part which passes through the secondblade of the shears or scissors. The projecting end of the screw-pivot Ais threaded, for applying thereon the screw-nut B. The outermost end ofthe screw-pivot A is made square for applying thereto a retainingcap-plate, 0, having a square center opening, a.

The screw-nut B is provided at its upper surface with a numberofsocket-holes, b, which are arranged in a circle concentric to the axisof the screw-pivot A, said holes serving to receive projectingpins batvthe under side of the cap-plate 0. When the screw-nut B is screwed inposition so as to exert the proper pressure upon the blades therap-plate O is placed over the same and secured in position on thescrew-nut B by a screw, D, the shank of which is inserted into athreaded sockethole of the square end of the screw-pivot A.

The projecting pins of thecap-plate enter into the holes of screw-nut B,so as to prevent the playing'loose of the same by the action of theshears and lockit securely in position on the screw pivot or bolt.

Having thus described my invention, Iclaim as new and desire to secureby LettersPatent-- The combination of a screw-pivot, A, having a fixedhead, A, at one end and a threaded shank with square end, of ascrew-nut, B, having socket-holes 1) arranged in a circle concen tric tothe axis of the screw-pivot, of a locking cap-plate, 0, havingprojectingpins b and a square center hole, a, fitting over the end ofthe screw-pivot, and of a. fastening-screw, D, that is applied into athreaded socket-hole of the square end ofthe screw-pivot, substantiallyas set.,forth.

In testimony thatI claim the foregoing as my invention I have signed. myname in presence of the subscribing witnesses.

HERMANN KEM MLER.

Witnesses Y J OHANNES Fuss, J AKOB RIEBER, WILH. GRIESINGER.

